package com.abner.design.patterns.facade;

/**
 * 屏幕
 * @author abner
 */
public class Screen {

	private Screen() {};

	private static Screen instance = new Screen();
	
	public static Screen getInstance() {
		return instance;
	}

	public void up() {
		System.out.println(" Screen up ");
	}
	
	public void down() {
		System.out.println(" Screen down ");
	}
	

}
